The GC controllers are connected to a USB hub, which is connected to the mobo. Here's the entire -v
C:\Users\Public\LaunchBox\Emulators\MAME>mame64 -v
Attempting load of mame.ini
Parsing mame.ini
Attempting load of mame.ini
Parsing mame.ini
Reading translation file English: 1 strings, original table at word offset 7, translated table at word offset 9
Loaded 0 translations from file English
Starting plugin data...
Attempting load of mame.ini
Parsing mame.ini
Attempting load of mame.ini
Parsing mame.ini
Video: Monitor 65537 = "\\.\DISPLAY1" (primary)
Direct3D: Using Direct3D 9
Physical width 1920, height 1080
Direct3D: Initialize
Direct3D: Configuring adapter #0 = NVIDIA GeForce GTX 1070
Direct3D: Using dynamic textures
Direct3D: YUV format = RGB
Direct3D: Max texture size = 16384x16384
Direct3D: Device created at 1920x1080
Direct3D: Initialize HLSL
RawInput: APIs detected
RawInput: APIs detected
RawInput: APIs detected
DirectSound: Primary buffer: 48000 Hz, 16 bits, 2 channels
Input: Adding keyboard #0: HID Keyboard Device (device id: \\?\HID#VID_046D&PID_C52B&MI_00#7&335f0d9f&0&0000#{884b96c3-56ef-11d1-bc8c-00a0c91405dd})
Input: Adding keyboard #1: HID Keyboard Device (device id: \\?\HID#VID_046D&PID_C52B&MI_00#8&2dd8c6cf&0&0000#{884b96c3-56ef-11d1-bc8c-00a0c91405dd})
Input: Adding mouse #0: HID-compliant mouse (device id: \\?\HID#VID_046D&PID_C52B&MI_01&Col01#7&af45fd6&0&0000#{378de44c-56ef-11d1-bc8c-00a0c91405dd})
Input: Adding mouse #1: HID-compliant mouse (device id: \\?\HID#VID_1241&PID_1111#9&e0e5631&0&0000#{378de44c-56ef-11d1-bc8c-00a0c91405dd})
Input: Adding mouse #2: HID-compliant mouse (device id: \\?\HID#VID_046D&PID_C52B&MI_01&Col01#8&56e1906&0&0000#{378de44c-56ef-11d1-bc8c-00a0c91405dd})
Input: Adding mouse #3: HID-compliant mouse (device id: \\?\HID#VID_046D&PID_C52B&MI_03#8&21615069&0&0000#{378de44c-56ef-11d1-bc8c-00a0c91405dd})
Input: Adding lightgun #0: HID-compliant mouse (device id: \\?\HID#VID_046D&PID_C52B&MI_01&Col01#7&af45fd6&0&0000#{378de44c-56ef-11d1-bc8c-00a0c91405dd})
Input: Adding lightgun #1: HID-compliant mouse (device id: \\?\HID#VID_1241&PID_1111#9&e0e5631&0&0000#{378de44c-56ef-11d1-bc8c-00a0c91405dd})
Input: Adding lightgun #2: HID-compliant mouse (device id: \\?\HID#VID_046D&PID_C52B&MI_01&Col01#8&56e1906&0&0000#{378de44c-56ef-11d1-bc8c-00a0c91405dd})
Input: Adding lightgun #3: HID-compliant mouse (device id: \\?\HID#VID_046D&PID_C52B&MI_03#8&21615069&0&0000#{378de44c-56ef-11d1-bc8c-00a0c91405dd})
Input: Adding joystick #0: USB Joystick (device id: USB Joystick product_00060079-0000-0000-0000-504944564944 instance_bff7ddf0-3bc5-11ea-8001-444553540000)
Input: Adding joystick #1: USB Joystick (device id: USB Joystick product_00060079-0000-0000-0000-504944564944 instance_df7d0510-3bc5-11ea-8002-444553540000)
Input: Adding joystick #2: USB Joystick (device id: USB Joystick product_00060079-0000-0000-0000-504944564944 instance_4d456930-4138-11ea-8001-444553540000)
Input: Adding joystick #3: USB Joystick (device id: USB Joystick product_00060079-0000-0000-0000-504944564944 instance_e09c7f90-413b-11ea-8002-444553540000)
Region ':user1' created
Optional memory region ':screen' not found
Starting No Driver Loaded ':'
(missing dependencies; rescheduling)
Starting Video Screen ':screen'
Starting No Driver Loaded ':'
Checking for icons in directory icons
No candidate icons found for machines
Attempting to parse: remap.cfg
Input: Remapped joystick #0: USB Joystick (device id: USB Joystick product_00060079-0000-0000-0000-504944564944 instance_bff7ddf0-3bc5-11ea-8001-444553540000)
Input: Remapped joystick #1: USB Joystick (device id: USB Joystick product_00060079-0000-0000-0000-504944564944 instance_e09c7f90-413b-11ea-8002-444553540000)
Attempting to parse: default.cfg
Attempting to parse: ___empty.cfg